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Old 10-23-2012, 11:47 PM   #1
907_fellow
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Default Mr. Matly yeast calc.

So looking at the mr.malty yeast calc, what exactly is the growth rate on the bottom? How is that determined ?

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Old 10-24-2012, 02:52 PM   #2
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JZ did years of research on yeast growth rates based on a number of variables. Those rates are based on his analysis of that data. It is not a constant, it is most likely a variable on size of starter and the viability of the yeast.

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Old 10-24-2012, 03:51 PM   #3
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But I have the ability to change it. Just wondering what a good set point for the growth rate is, seeing how moving the growth rate between 2 and 6 has drastic changes to both the size of the start, and number if packets/vials to use.

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Old 10-24-2012, 05:31 PM   #4
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Quote:
Originally Posted by 907_fellow
But I have the ability to change it. Just wondering what a good set point for the growth rate is, seeing how moving the growth rate between 2 and 6 has drastic changes to both the size of the start, and number if packets/vials to use.
IMO I would not change the growth rate that's set. The selection of using a stir plate, intermittent shaking or nothing will really determine the growth rate for you.

Unless you have a lab and the experience greater than those that created the site and its math it's best to just plug your numbers in for gravity, batch size, date if yeast and method of stirring/shaking
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Old 10-24-2012, 05:34 PM   #5
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So leaving the growth rate at 2 (the lowest setting) is probably the best, conservative, approach? That's kinda what I assumed but didn't know for sure. This is what I got for my next brew...
image-1567171085.jpg

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Old 10-24-2012, 06:32 PM   #6
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There are multiple ways to get the same amount of yeast. You can pitch several packets into a small starter, or you can use a large starter with only one pack. The growth rate slider allows you to choose which approach you want to use.

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Old 10-24-2012, 08:06 PM   #7
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I always adjust my growth rate so that I only need to use one vial/smackpack- that should change the size of the starter it suggests.

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Old 10-24-2012, 08:07 PM   #8
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Quote:
Originally Posted by daksin
I always adjust my growth rate so that I only need to use one vial/smackpack- that should change the size of the starter it suggests.
Ok. I will go that route.
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Old 10-24-2012, 08:11 PM   #9
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Quote:
Originally Posted by AmandaK View Post
JZ ...
JZ?! Man, I love his song "99 Beers but a Bud aint one"!
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Old 10-24-2012, 08:17 PM   #10
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Quote:
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JZ?! Man, I love his song "99 Beers but a Bud aint one"!
Heard dat!
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